Icon for a display screen



FIG. 1 is a front view of an icon for a display screen showing our new design,

FIG. 2 is an additional front view thereof, showing additional unclaimed subject matter; and,

FIG. 3 is a front view of a third embodiment of our new design.

The broken line showing of the rectangular boxes in FIGS. 2 and 3, the characters X, Y and Z in FIG. 3, and the display screen forms no part of the claimed design. 

The ornamental design for an icon for a display screen, as shown and described. 